JOURNAL OF LUMINESCENCE
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2023
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IF 3.6
Zuodong Liu,Yue Cao,Jiashun Wang,Siya Li,Qilong Shen,Yongsheng Yu,Bingchu Mei,Qiangshan Jing,Peng Liu
Near-infrared pumped up-conversion luminescent PrF 3 and YbF 3 co-doped SrF 2 ceramics were fabricated by the hot-pressing sintering technique, and the pellets were transparent with a primrose yellow appearance. The influence of YbF 3 co-doping levels on the optical qualities and microstructures of ceramics was investigated. We identified the mechanisms to realize up-conversion luminescence in the visible range from 3 P 0,1 levels (Pr 3+ ) under near-infrared wavelength pumping sources other than the near ultraviolet to blue region photons. Yb 3+ ions inducing a broad and intense absorption band at the 900–1050 nm region, and the absorption coefficient and cross-section at 980 nm are 7.57 cm −1 and 4.19 × 10 −21 cm 2 in the ceramic co-doped with 15 wt% YbF 3 , respectively. The intense up-conversion luminescence bands at 480, 520, 540, and 600 nm under 980 nm excitation were attributed to 3 P 0 → 3 H 4 , 3 P 1 → 3 H 5 , 3 P 0 → 3 H 5 and 1 D 2 → 3 H 4 transitions of Pr 3+ ions, respectively.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2021
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IF 5.302
Zuodong Liu,Yumeng Ji,Chunyan Xu,Yuqing Wang,Yang Liu,Qilong Shen,Guoqiang Yi,Yongsheng Yu,Bingchu Mei,Peng Liu,Qiangshan Jing
Raw SrF 2 powders were synthesized by the chemical precipitation method, and the mean particle size was 58.48 nm. Er:SrF 2 transparent ceramics were obtained by hot-pressed (HP) technique, and the effect of ErF 3 levels on the transparency, microstructure, luminescence spectroscopic and microhardness were studied. The ratio of emission intensities R (Red/Green) increased with the ErF 3 doping levels. The addition of ErF 3 was found effectively to reduce grain size and has a positive effect on improving the microhardness. The SrF 2 ceramic doped with 5 wt.% ErF 3 (2 mm thick) showed the best optical transparency, the transmittance at 500 nm and 1200 nm are 87.9 % and 89.5 %, respectively. The average grain size, Vickers hardness ( Hv ), and fracture toughness ( K IC ) for the SrF 2 ceramic were 21.1 ± 4.5 μm, 1.73 ± 0.04 GPa, and 0.52 ± 0.08 MPa·m 1/2 , respectively.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Zhiwei Zhou,Yongqiang Zhang,Xinwen Liu,Bingchu Mei,Liping Zhou,Jianchun Qin,Dan Yuan
0.5–5 % (atom percent) Nd 3+ -doped SrF 2 transparent ceramics were fabricated by hot-pressed sintering and the effects of Nd 3+ doping content on microstructure and spectral properties were studied. With Nd 3+ content increased from 0.5 % to 5 %, in-line transmittance of Nd:SrF 2 ceramic at 1060 nm increased from 15.8 % to 85.3 %. FE-SEM micrographs showed the grain growth was inhibited and the microstructure became more compact and homogenous. Emission spectra revealed that concentration quenching was occurred at Nd 3+ content of 1–2 %. Emission lifetime of 4 F 3/2 energy level monotonously decreased from 1805.4 μs to 19.6 μs. Evolution profiles of emission intensity and lifetime of Nd:SrF 2 transparent ceramic with Nd 3+ doping content were proposed. The appropriate Nd 3+ content for spectral properties of Nd:SrF 2 transparent ceramic was found around 1 %. The results demonstrated Nd:SrF 2 transparent ceramic has large emission lifetime and mild concentration quenching effect, indicating that Nd 3+ -doped SrF 2 transparent ceramics could be more promising gain media for all-solid-state lasers than other Nd 3+ -doped alkaline-earth fluorides.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
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2021
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IF 3.08
Zuodong Liu,Qilong Shen,Yuqing Wang,Songchang Fu,Litao Yang,Xue Chen,Bing Liu,Guoqiang Yi,Bingchu Mei,Qiangshan Jing,Peng Liu
A series of PrF 3 -doped SrF 2 ceramics were fabricated by the hot-pressed (HP) sintering method. The influence of PrF 3 concentrations on the microstructure and optical characterizations of transparent ceramics was investigated. PrF 3 doping was found to have a positive effect on increasing optical transmittance . The luminescence intensity and lifetime quenching of Pr:SrF 2 ceramics at high doping concentrations were attributed to the Pr 3+ -Pr 3+ interactions through the intense CR process. The luminescence color of Pr:SrF 2 ceramics was tuned from the blue region to the reddish region, and finally to the orange region with increasing PrF 3 concentrations. The effect of sintering temperature on the optical transmittance and microstructure of Pr:SrF 2 ceramics was also measured and discussed. The highest transmittance of the Pr:SrF 2 ceramic (doped with 5 wt% PrF 3 and sintered at 950 °C) at 350 nm and 1200 nm were 90.4% and 91.9%, respectively.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2022
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IF 5.532
Meng Fei Zhou,Cheng Chao Hu,Jian Bing Yin,Yu Jiang,Bing Liu,Kai Xin Song
SrF 2 is a promising low- ε r fluoride with outstanding microwave dielectric properties , while densification of SrF 2 ceramics is challenging via traditional thermal sintering (TTS). In this work, dense SrF 2 ceramics with 93.4%–97.2% relative density have been obtained via cold sintering (300 MPa–900 MPa, 150 °C, 1 h) and subsequent post-annealing at 950 °C/3 h. The pretreated cold sintering process is beneficial for microstructure optimization, where the maximum Qf value (62,037 GHz) is obtained at 750 MPa, nearly three times higher than the TTS sample (21,080 GHz). An ultra-low dielectric constant ( ε r ) of 5.94 is simultaneously obtained, together with a temperature coefficient of resonant frequency τ f = −78.26 ppm/°C. Good chemical compatibility between SrF 2 ceramics and silver is verified, indicating great promise for their use in LTCC technology. Moreover, the low- ε r and high Qf values of the cold sintering optimized SrF 2 ceramics suggest great potential in the 5G millimeter-wave antenna systems. A SrF 2 -based dielectric resonator antenna is designed and fabricated, which resonates at the desired 24.5 GHz and exhibits an outstanding S 11 of −43.95 dB and a broad bandwidth of 4.51 GHz.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）